Measurement of the magnetic dipole moment ofβ-emittingS31by use of a polarized proton beam and nuclear magnetic resonance detection

Abstract

Polarized $\beta$-emitting ${}_{}{}^{31}{}_{}{}^{}\mathrm{S}$ nuclei ($I^{\pi }={\frac{1}{2}}^{+}$, $T_{\frac{1}{2}}=2.6\mathrm{}$ s) were produced in the reaction ${}_{}{}^{31}{}_{}{}^{}\mathrm{P}(\overrightarrow{p},n){}_{}{}^{31}{}_{}{}^{}\mathrm{S}$ $E_p=7.9$ MeV, in a thick target of red phosphorous which served also as host for the implanted ${}_{}{}^{31}{}_{}{}^{}\mathrm{S}$ nuclei. The net polarization transferred to the ${}_{}{}^{31}{}_{}{}^{}\mathrm{S}$ nuclei, observed by measuring the $\beta$-decay asymmetry, was antiparallel to the proton polarization for direct ground-state production and parallel for production through the first excited state. The magnetic dipole moment of ${}_{}{}^{31}{}_{}{}^{}\mathrm{S}$, measured by nuclear-magnetic-resonance destruction of the polarization, is $\left|\mu \right|=\left[0.487\mathrm{} 93\right(8\left)\right]{\mu }_N$, including the diamagnetic correction.